대한전자공학회논문지TC (Journal of the Institute of Electronics Engineers of Korea TC)

대한전자공학회 (The Institute of Electronics and Information Engineers)
권호 표지

이동통신 채널에서 적응터보부호화 변조방식의 성능분석

Performance analysis of adaptive turbo coded modulation over mobile communication channel

  • 김연수 (경북대학교 전자전기컴퓨터학부) ;
  • 이상훈 (경북대학교 전자전기컴퓨터학부) ;
  • 주언경 (경북대학교 전자전기컴퓨터학부)
  • Kim, Yeon-Su (School of Electrical Engineering and Computer Science, Kyungpook National University) ;
  • Lee, Sang-Hoon (School of Electrical Engineering and Computer Science, Kyungpook National University) ;
  • Joo, Eon-Kyeong (School of Electrical Engineering and Computer Science, Kyungpook National University)
  • 발행 : 2006.10.25
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초록

채널환경에 따라 변조방식이 가변되는 적응변조에 의해 높은 대역효율을 얻을 수 있다. 그러므로 시간에 따라 채널이 바뀌는 이동통신 채널에는 특히 적응변조가 적합하다. 이동체의 속도에 따라 적절하게 변조방법을 바꾸기 위해서는 신호대 잡음비의 최적 문턱값을 결정하여야 한다. 따라서 본 논문에서는 특정 이동체의 속도에 대하여 터보부호를 사용할 경우 요구 비트오율 $10^{-6}$을 얻을 수 있는 최적 문턱값을 결정한다. 이를 바탕으로 보간법에 의해서 이동체의 연속적인 속도에 대한 최적 문턱값을 제안한다. 그리고 다양한 이동체의 속도와 채널환경에 대해 그 오류성능 및 대역효율을 분석한다.

High spectral efficiency can be obtained by adaptive modulation in which the modulation scheme is changed according to the channel environment. Thus it is especially suitable to mobile channel which is a typical example of time-varying channel. It is required to determine the optimum thresholds of signal-to-noise ratio(SNR) to change the modulation scheme effectively according to mobile speeds. Thus the optimum thresholds for specific mobile speeds to get the required bit error rate(BER) of $10^{-6}$ are obtained with the powerful turbo code in this paper. In addition, the optimum thresholds for the continuous mobile speed are proposed by interpolation of the obtained results. And the error performance and average spectral efficiency are investigated at various mobile speeds and channel environments.

키워드

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